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)(25,26,28,30)(27,34,35,32)(29,31,37,33)(36,39,40,38)(1,3,4,8)(2,5,6,7)(9,11,14,19)(10,15,12,17)(13,18,21,24)(16,22,20,23)(26,30)(31,33)(32,34)(38,39)(3,8)(5,7)(9,12,14,10)(11,17,19,15)(13,16,21,20)(18,22,24,23)(26,31)(27,35)(29,37)(30,33)(32,39)(34,38)(2,6)(5,7)(9,13,14,21)(10,16,12,20)(11,18,19,24)(15,22,17,23)(25,27,28,35)(26,32,30,34)(29,36,37,40)(31,38,33,39)(11,19)(15,17)(18,24)(22,23)(27,35)(32,34)(36,40)(38,39) 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.