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