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