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