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