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