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