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