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