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