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