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