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