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