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