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