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