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