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