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