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