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