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