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