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