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