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