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