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