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