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