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