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