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