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