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