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