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