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