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