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