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