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