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