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