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