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