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