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