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