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