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