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