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