One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,7)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18)(19,22)(20,24)(21,23)(25,29)(26,31)(27,30)(28,32) involution — undirected(1,3)(2,6)(4,7)(5,8)(9,11)(10,13)(12,16)(14,15)(17,19)(18,22)(20,25)(21,26)(23,31)(24,29)(27,28)(30,32) involution — undirected(1,4,5,6)(2,3,7,8)(10,14)(13,15)(19,25)(20,28)(22,29)(24,32)(26,27)(30,31)(2,7)(3,8)(11,16)(13,15) involution — undirected(18,23)(19,26)(24,32)(25,27) 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.