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