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