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