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