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