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)(11,15)(12,13)(14,16)(17,18,21,25)(19,26,29,23)(20,30,22,24)(27,28,32,31)(1,3,5,4)(2,6,7,8)(9,10)(11,14)(12,13)(15,16)(17,18,21,25)(19,27,29,32)(20,24,22,30)(23,31,26,28)(1,4,5,3)(2,6,7,8)(10,13)(14,15)(17,18)(19,26)(20,30)(21,25)(22,24)(23,29)(27,31)(28,32)(9,11,12,16)(10,14,13,15)(17,19,21,29)(18,23,25,26)(20,28,22,31)(24,32,30,27)(2,7)(6,8)(17,20,21,22)(18,24,25,30)(19,28,29,31)(23,32,26,27)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.