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