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