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