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