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