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