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