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