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)(11,16)(12,14)(13,15)(17,18,21,20,22,24,29,28)(19,23,27,26,25,30,32,31)(2,5)(3,7) involution — undirected(9,11,13,12)(10,14,15,16)(17,19)(18,23)(20,26)(21,27)(22,25)(24,30)(28,31)(29,32)(1,3,4,7)(2,6,5,8)(9,12,13,11)(10,14,15,16)(19,25)(23,30)(26,31)(27,32)(2,5)(6,8)(17,20,21,24,22,28,29,18)(19,26,27,30,25,31,32,23)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.