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