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