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