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