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