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