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