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