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