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