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