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