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