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