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