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