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