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