Improve figure resolution

I created a graph using two opi layout with 31 nodes. But the figure looks very small . Can anyone suggest way to improve this figure resoultion

digraph G {
layout=twopi
ranksep=30;
ratio=auto;
overlap=false
“AFF4” [ label=“AFF4”,shape=“hexagon”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“BCL11B” [ label=“BCL11B”,shape=“hexagon”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“CREB1” [ label=“CREB1”,shape=“hexagon”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“CTCF” [ label=“CTCF”,shape=“hexagon”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“KDM2B” [ label=“KDM2B”,shape=“hexagon”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“STAG1” [ label=“STAG1”,shape=“hexagon”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“CERS6” [ label=“CERS6”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“DPEP1” [ label=“DPEP1”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“H2BC5” [ label=“H2BC5”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“HMGN4” [ label=“HMGN4”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“KDM3B” [ label=“KDM3B”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“NT5DC2” [ label=“NT5DC2”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“PGBD1” [ label=“PGBD1”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“PLXNA4” [ label=“PLXNA4”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“RBM4B” [ label=“RBM4B”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“SCGN” [ label=“SCGN”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“SCN3A” [ label=“SCN3A”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“SP4” [ label=“SP4”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“THSD7A” [ label=“THSD7A”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“TNKS” [ label=“TNKS”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“grey” ];
“FADS2” [ label=“CERS6”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“PACS1” [ label=“DPEP1”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“PBRM1” [ label=“H2BC5”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“PHIP” [ label=“HMGN4”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“RBM4” [ label=“KDM3B”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“RPL13” [ label=“NT5DC2”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“SS18L1” [ label=“PGBD1”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“SSBP2” [ label=“PLXNA4”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“UBTF” [ label=“RBM4B”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“ZSCAN12” [ label=“SCGN”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“ZSCAN2” [ label=“SCN3A”,shape=“box”,width=1.2, height=1.5, fontname=“helvetica”,fontsize=“50”, style=“filled”,color=“green” ];
“AFF4” → “FADS2”[ label=" “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “PBRM1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “PACS1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “SS18L1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “UBTF”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “RPL13”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “ZSCAN12”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “PHIP”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “SSBP2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “ZSCAN2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“AFF4” → “RBM4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “PLXNA4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “RBM4B”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “FADS2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “PBRM1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “PACS1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “SS18L1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “UBTF”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “RPL13”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “PHIP”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “SCGN”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “SSBP2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “ZSCAN2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “PLXNA4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “CREB1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “TNKS”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CREB1” → “SP4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “RBM4B”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “FADS2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “PBRM1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “PACS1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “UBTF”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “RPL13”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “ZSCAN2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “BCL11B”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “KDM3B”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “NT5DC2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “PLXNA4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “DPEP1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “CTCF”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “H2BC5”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “SCN3A”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “PGBD1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “CERS6”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “TNKS”[ label=” “,color=“blue”,arrowhead=“normal” ];
“CTCF” → “SP4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“KDM2B” → “UBTF”[ label=” “,color=“blue”,arrowhead=“normal” ];
“KDM2B” → “RPL13”[ label=” “,color=“blue”,arrowhead=“normal” ];
“KDM2B” → “SSBP2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“KDM2B” → “BCL11B”[ label=” “,color=“blue”,arrowhead=“normal” ];
“KDM2B” → “DPEP1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“KDM2B” → “KDM2B”[ label=” “,color=“blue”,arrowhead=“normal” ];
“KDM2B” → “HMGN4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “FADS2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “SS18L1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “PHIP”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “SCGN”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “SSBP2”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “BCL11B”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “PLXNA4”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “STAG1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “PGBD1”[ label=” “,color=“blue”,arrowhead=“normal” ];
“STAG1” → “THSD7A”[ label=” ",color=“blue”,arrowhead=“normal” ];
overlaps=false
}

Thank you

What output format did you use? What command did you run (e.g. twopi -Tpdf) ?

If anyone tries to copy the above, note that it includes non-ASCII characters that need to be replaced w/ ASCII