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