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