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