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