If I'm reading things correctly, it is. It's at the top of the graph images. For example "(Blue=23664 Liberals, Red=4489 Conservatives, Grey=18 Less Wrong)".
While we're discussing the graph - is anyone else seeing the yellow libertarian graphs as 'orange'? (Or is this just Redshift screwing up my color perception?)
Here's the news article on this: http://www.yourmorals.org/blog/2011/11/how-to-use-groups-at-yourmorals-org/
And here's the group that the LW community just created: http://www.yourmorals.org/setgraphgroup.php?grp=623d5410f705f6a1f92c83565a3cfffc
I think it will be very interesting to see what we can all get on this.