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