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)(27,28)(29,32)(30,33)(31,34)(35,36)(37,40)(38,39)(1,2,5,6)(3,8,4,7)(9,11)(10,14)(12,19)(13,18)(15,23)(16,22)(17,20)(21,24)(25,27,31,30)(26,28,34,33)(29,35,38,37)(32,36,39,40)(9,12)(10,15)(11,17)(13,20)(14,21)(16,24)(18,19)(22,23)(25,28,27,26,31,33,30,34)(29,36,35,32,38,40,37,39)(1,3,5,4)(2,7,6,8)(12,20)(15,24)(17,19)(21,23)(25,29)(26,32)(27,35)(28,36)(30,37)(31,38)(33,40)(34,39)(1,4,5,3)(2,7,6,8)(10,16)(11,18)(15,24)(17,19)(25,27,31,30)(26,33,34,28)(29,37,38,35)(32,36,39,40)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.