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