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