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