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