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