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