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