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