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