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