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