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