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