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