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