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