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