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