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