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