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