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