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