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