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