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