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