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