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