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