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)(27,36)(28,33)(29,34)(30,39)(31,35)(32,38)(37,40)(1,2,4,5)(3,6,7,8)(9,11,13,19)(10,14,16,17)(12,18,21,24)(15,22,20,23)(27,37)(28,32)(33,38)(36,40)(2,5)(6,8)(12,21)(15,20)(18,24)(22,23)(25,27,30,38,31,37,29,33)(26,32,34,36,35,28,39,40)(1,3,4,7)(2,6,5,8)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(25,28)(26,33)(27,34)(29,36)(30,40)(31,32)(35,38)(37,39)(11,19)(14,17)(18,24)(22,23)(25,29,31,30)(26,34,35,39)(27,33,37,38)(28,40,32,36)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.