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