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