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