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