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