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