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