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