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