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