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