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