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