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