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