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