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