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