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