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