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