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