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