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