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