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