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