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