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