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