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