One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(9,10)(11,13)(12,14)(15,16)(17,18)(19,23)(20,29)(21,26)(22,27)(24,28)(25,30)(31,32) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,11,12,15)(10,13,14,16)(17,19,21,28)(18,23,26,24)(20,22,30,31)(25,32,29,27)(10,14)(13,16)(17,19,22,20,21,28,31,30)(18,24,27,25,26,23,32,29)(1,3,4,7)(2,6,5,8)(2,5)(6,8)(17,20,22,28,21,30,31,19)(18,25,27,23,26,29,32,24)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.