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