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