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