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