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