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