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