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