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