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