I guess its real name is Genève Roule:
http://www.ville-ge.ch/geneve/amenag...blications.htm
All the bike shops have it, as well as the luggage claim booth at the train station. It's free!
Ah, here's the PDF:
http://www.ville-ge.ch/geneve/amenag.../pdf/carte.pdf
As you can see it also covers the canton. There's a more detailed map of the city on the other side.
In fact I'm thinking about taking a longer ride sometime in the coming days if you're looking for somebody to ride with.