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