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