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