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