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