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