One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,12,7,11,22,25,8,13,21,10,5,23,4,20)(3,14,19,26,16,29,31,32,17,9,24,28,18,27,15,30)(1,3,4,15,5,18,21,24,8,17,22,31,7,16,6,19)(2,9,25,30,23,29,12,28,13,14,20,32,11,27,10,26)(1,4,5,21,8,22,7,6)(2,10,11,20,13,12,23,25)(3,15,18,24,17,31,16,19)(9,26,27,32,14,28,29,30)(3,16,17,18)(9,27,14,29)(15,19,31,24)(26,32,28,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.