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