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