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