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