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