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