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