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