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