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