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)(21,25)(24,30)(27,31) involution — undirected(9,10)(11,15)(12,16)(13,14)(17,18,22,23)(19,24,28,30)(20,25,29,21)(26,31,32,27)(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)(21,27,25,31)(1,4,6,5)(2,3,7,8)(17,20)(18,25)(19,26)(21,23)(22,29)(24,31)(27,30)(28,32)(1,5,6,4)(2,8,7,3)(9,12,13,11)(10,16,14,15)(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.