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