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