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