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