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