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