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