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