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