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