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