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