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