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