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