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)(11,16)(12,14)(13,15)(19,27)(23,31)(28,32)(29,30) involution — undirected(1,3)(2,5)(4,8)(6,7)(17,18,21,26)(19,28,27,32)(20,24,22,25)(23,30,31,29)(9,11,13,12)(10,14,15,16)(17,19,21,27)(18,23,26,31)(20,29,22,30)(24,32,25,28)(2,6)(5,7)(17,20,21,22)(18,24,26,25)(19,29,27,30)(23,32,31,28)(3,8)(5,7)(9,12,13,11)(10,14,15,16)(18,25)(20,22)(23,28)(24,26)(29,30)(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.