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