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