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