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