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