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