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