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