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