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