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