digraph G {
    margin=0;
    a [style=bold, label="and"];
    s [label=<<FONT COLOR="red" FACE="helvetica">op1</FONT>>];
    d [label=<<FONT COLOR="red" FACE="helvetica">op2</FONT>>];
    
    a->s [label="op1"];
    a->d [label="op2"];
}
