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