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