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