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