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