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