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