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)(15,24)(16,21)(17,22)(18,27)(19,23)(20,26)(25,28) involution — undirected(1,2)(3,4)(6,10)(11,12)(15,25)(16,20)(21,26)(24,28) involution — undirected(2,4)(5,7,9,8)(6,11,10,12)(13,15,18,26,19,25,17,21)(14,20,22,24,23,16,27,28)(1,2)(3,4)(5,8,9,7)(6,12,10,11)(13,16)(14,21)(15,22)(17,24)(18,28)(19,20)(23,26)(25,27)(2,4)(13,17,19,18)(14,22,23,27)(15,21,25,26)(16,28,20,24)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.