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