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