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