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