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