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