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