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