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