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