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