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