One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,15)(12,13)(14,16)(21,29)(25,30)(26,32)(28,31) involution — undirected(1,3,6,4)(2,7,8,5)(9,11)(10,14)(12,15)(13,16)(17,18)(19,20)(21,25)(22,23)(24,27)(26,28)(29,30)(31,32)(1,4,6,3)(2,7,8,5)(9,12,13,10)(11,15,16,14)(18,23)(20,24)(25,30)(28,31)(1,5,6,7)(2,4,8,3)(9,11)(10,15)(12,14)(13,16)(17,19)(18,24)(20,23)(21,26)(22,27)(25,31)(28,30)(29,32)(17,20,22,24)(18,19,23,27)(21,28,29,31)(25,26,30,32)(17,21,22,29)(18,25,23,30)(19,26,27,32)(20,28,24,31)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.