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