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