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