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