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