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