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