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