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