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