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