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