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