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