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