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