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