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