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