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