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