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