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