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