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