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)(11,12,16,19,17,22,15,21)(13,18,23,34,26,31,25,33)(14,27,30,36,29,35,28,20)(24,38,39,41,40,42,37,32)(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)(35,42)(36,41)(3,6,7,10)(4,8,5,9)(12,19)(13,23)(15,16)(18,31)(20,35)(21,22)(24,37)(25,26)(27,36)(28,30)(32,41)(39,40)(4,5)(8,9)(11,14,17,29)(12,20,22,36)(13,24,26,40)(15,30,16,28)(18,32,31,41)(19,35,21,27)(23,37,25,39)(33,38,34,42)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.