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