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