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