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