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)(20,25)(21,23)(22,30)(24,28)(27,32)(29,31) involution — undirected(1,2)(3,7)(4,6)(5,8)(9,11,13,10)(12,15,16,14)(18,23)(19,27)(25,30)(28,29)(1,3)(2,5)(4,8)(6,7)(10,11)(12,16)(17,19,20,29,21,27,22,28)(18,24,30,32,23,31,25,26)(2,6)(3,8)(9,12,13,16)(10,14,11,15)(17,20,21,22)(18,25,23,30)(19,28,27,29)(24,32,31,26)(2,6)(5,7)(10,11)(14,15)(18,23)(24,31)(25,30)(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.