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