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)(26,30)(27,35)(28,38)(34,40)(3,7)(6,8)(11,13)(15,18)(19,20)(22,23)(25,26,31,30)(27,36,35,32)(28,33,38,39)(29,40,37,34)(1,2)(3,6)(4,5)(7,8)(9,11,14,13)(10,15,17,18)(12,20,21,19)(16,23,24,22)(25,27,31,35)(26,32,30,36)(28,37,38,29)(33,40,39,34)(9,12,14,21)(10,16,17,24)(11,19,13,20)(15,22,18,23)(25,28)(26,33)(27,37)(29,35)(30,39)(31,38)(32,40)(34,36)(1,3)(2,6)(4,7)(5,8)(9,13,14,11)(10,15,17,18)(12,19,21,20)(16,23,24,22)(25,29,31,37)(26,34,30,40)(27,28,35,38)(32,33,36,39)(1,2)(3,6)(4,5)(7,8)(9,10)(11,18)(12,16)(13,15)(14,17)(19,23)(20,22)(21,24)(25,30,31,26)(27,36,35,32)(28,39,38,33)(29,40,37,34)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.