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