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