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