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