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