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