One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,8)(9,10)(11,12)(13,14,19,21)(15,22,17,18)(16,20,25,28)(23,27,26,24)(1,2)(3,4)(5,7)(6,8)(9,11)(10,12) involution — undirected(7,11)(8,12)(13,15,19,17)(14,18,21,22)(16,23,25,26)(20,24,28,27)(6,10)(8,12)(13,16)(14,20)(15,23)(17,26)(18,24)(19,25)(21,28)(22,27) involution — undirected(5,8)(6,7)(9,12)(10,11)(13,17,19,15)(14,18,21,22)(16,23,25,26)(20,27,28,24)(5,6)(7,8)(9,10)(11,12)(13,18)(14,15)(16,24)(17,21)(19,22)(20,23)(25,27)(26,28) involution — undirectedA 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.