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