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