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