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