One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,12,8,13,7,23)(3,9,16,27,17,29,24,28)(4,18,5,11,20,32,21,10)(14,31,19,26,22,30,15,25)(1,3,6,16,8,17,7,24)(2,9,12,27,13,29,23,28)(4,19,21,14,20,15,5,22)(10,30,32,26,11,31,18,25)(1,4,6,21,8,20,7,5)(2,10,12,32,13,11,23,18)(3,14,16,15,17,22,24,19)(9,25,27,30,29,26,28,31)(1,5,6,20,8,21,7,4)(2,11,12,32,13,10,23,18)(3,15,16,14,17,19,24,22)(9,26,27,30,29,25,28,31)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.