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