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