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