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