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