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