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