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