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