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