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