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