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