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