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