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