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