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