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