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