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