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