One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(4,6)(7,8,10,9)(11,12,16,20)(13,21,25,35)(14,18,26,32)(15,28,22,19)(17,29,31,24)(23,34,37,42)(27,39,36,33)(30,40,41,38)(11,13,22,29,16,25,15,24)(12,17,28,35,20,31,19,21)(14,23,36,40,26,37,27,38)(18,30,39,42,32,41,33,34)(3,4,5,6)(11,14,16,26)(12,18,20,32)(13,23,25,37)(15,27,22,36)(17,30,31,41)(19,33,28,39)(21,34,35,42)(24,38,29,40)(7,9,10,8)(14,26)(18,32)(23,37)(27,36)(30,41)(33,39)(34,42)(38,40)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.