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