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