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