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)(17,18,21,23)(19,26,28,32)(20,25,22,30)(24,27,31,29)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(18,23)(24,31)(25,30)(26,32) involution — undirected(11,15)(13,16)(17,19,21,28)(18,24,23,31)(20,29,22,27)(25,32,30,26)(11,15)(13,16)(17,20,21,22)(18,25,23,30)(19,27,28,29)(24,26,31,32)(1,3,4,7)(2,6,5,8)(10,14)(13,16)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.