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