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