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