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