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