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