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