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