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