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