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