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