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