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