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