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