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