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