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