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)(11,19)(12,23)(13,18)(14,16)(15,22)(17,21)(20,24)(1,3,5,8)(2,6,4,7)(9,11)(10,15)(12,20)(13,21)(14,22)(16,19)(17,24)(18,23)(25,26,30,31)(27,32,37,40)(28,33,38,36)(29,34,39,35)(1,2,5,4)(3,6,8,7)(10,16)(15,19)(17,23)(18,24)(26,31)(29,39)(32,40)(33,36)(1,2,5,4)(3,6,8,7)(9,10)(11,15)(12,17)(13,18)(14,16)(19,22)(20,24)(21,23)(25,27)(26,32)(28,34)(29,36)(30,37)(31,40)(33,39)(35,38)(1,4,5,2)(3,7,8,6)(9,12,14,21)(10,17,16,23)(11,20,22,13)(15,24,19,18)(25,28)(26,33)(27,35)(29,32)(30,38)(31,36)(34,37)(39,40)(9,13,14,20)(10,18,16,24)(11,21,22,12)(15,23,19,17)(25,29)(26,34)(27,36)(28,32)(30,39)(31,35)(33,37)(38,40)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.