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