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