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