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