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