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