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