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)(19,22)(20,21)(23,24)(25,26,31,35)(27,36,29,32)(28,33,34,30)(37,38,39,40)(2,5)(6,8)(10,12)(14,15)(18,20)(19,23)(25,27,31,29)(26,32,35,36)(28,39,34,37)(30,40,33,38)(9,11)(10,14)(12,15)(13,16)(17,18,21,20)(19,22,23,24)(25,28,31,34)(26,33,35,30)(27,37,29,39)(32,40,36,38)(1,2)(3,6)(4,5)(7,8)(9,11)(10,14)(12,15)(13,16)(17,19,21,23)(18,22,20,24)(25,29,31,27)(26,32,35,36)(28,37,34,39)(30,40,33,38)(1,3)(2,6)(4,7)(5,8)(9,12,13,10)(11,15,16,14)(17,20,21,18)(19,24,23,22)(25,30,31,33)(26,34,35,28)(27,38,29,40)(32,39,36,37)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.