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