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