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