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