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