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