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