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