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