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