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