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