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