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