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