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