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