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