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