selecting random colors

Using the graph tab, how do I avoid "black only" games?

I like the graph layout, so I don't like going to the list tab.. However, many players who select white only or black only are listed and non-distinguishable from the random colors tab.

If someone knows how to do this, or if that feature can be added to graph layout, that would be great!
Thanks,

instead of "random colors tab", the above message should read "random colors games"