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