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