The artists on that issue were Dan Jurgens and Karl Kesel. However, when the same diagram was re-printed in Who's Who: The Definitive Directory of the DC Universe (vol 13), the art was credited to Keith Giffen and Larry Mahlstedt.
My favorite part of this is the note on the right saying that no Legionnaire wanted to have living quarters near Brainiac 5's laboratory. Too funny!
Click on the picture to Colossal Boy it.