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