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