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