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