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