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