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