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