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