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