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