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