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