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