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