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