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