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