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