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