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