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