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