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