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