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