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