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