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