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