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