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