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