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