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