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