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