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