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