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