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