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