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