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