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