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