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