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