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