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