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