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