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