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