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)(13,14,18,22)(15,19,16,20)(17,21,24,27)(23,26,25,28)(5,6)(7,10)(8,12)(9,11)(15,23)(16,25)(17,24)(19,26)(20,28)(21,27) involution — undirected(1,2,3,4)(13,15,24,25,18,16,17,23)(14,19,27,28,22,20,21,26)(5,7,9,8)(6,10,11,12)(15,16)(19,20)(23,25)(26,28)(5,8,9,7)(6,10,11,12)(13,16,24,23,18,15,17,25)(14,20,27,26,22,19,21,28)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.