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