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