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