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