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