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