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