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