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