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