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