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