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