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