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