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