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