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