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