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