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