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