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)(11,16)(12,20)(13,18)(14,15)(17,21)(19,24)(22,23)(25,26,31,35)(27,33,37,30)(28,32,29,34)(36,38,39,40)(2,5)(6,7)(10,15)(12,21)(16,24)(18,22)(25,27,31,37)(26,30,35,33)(28,36,29,39)(32,40,34,38)(1,2)(3,6)(4,5)(7,8)(10,15)(13,23)(16,24)(17,20)(25,28,31,29)(26,32,35,34)(27,36,37,39)(30,40,33,38)(1,2)(3,6)(4,5)(7,8)(9,11)(10,16)(12,22)(13,17)(14,19)(15,24)(18,21)(20,23)(25,27)(26,33)(28,36)(29,39)(30,35)(31,37)(32,38)(34,40) involution — undirected(1,3,4,8)(2,6,5,7)(9,12,14,21)(10,17,15,20)(11,18,19,22)(13,16,23,24)(25,29,31,28)(26,34,35,32)(27,36,37,39)(30,40,33,38)(9,13,14,23)(10,18,15,22)(11,17,19,20)(12,16,21,24)(25,30,31,33)(26,27,35,37)(28,38,29,40)(32,39,34,36)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.