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