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