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