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