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