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