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