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