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