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