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