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