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