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