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