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