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