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