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