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