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