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