digraph G {
    node [shape=circle];
    a -> b [label="label",lblstyle="draw=red,cross out"];
    b -> c [label="test",lblstyle="below=0.5cm,rotate=20,fill=blue!20"];
    a [label="aa",lblstyle="blue"];
    b [lblstyle="font=\Huge"];
    c [label="ccc", lblstyle="red,rotate=90"];
    rankdir=LR;
    label="Graph label";
    lblstyle="draw,fill=red!20";
}