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