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