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