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