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