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