graph Transparency { layout=neato start=11 // empiric value to set orientation bgcolor="#0000ff11" node [shape=circle width=2.22 label="" style=filled] 5 [color="#0000ff80"] 6 [color="#ee00ee80"] 1 [color="#ff000080"] 2 [color="#eeee0080"] 3 [color="#00ff0080"] 4 [color="#00eeee80"] 1 -- 2 -- 3 -- 4 -- 5 -- 6 -- 1 }