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