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