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