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