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