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