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