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