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