One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6,8,10)(7,9,12,11)(13,14,19,17)(15,23,24,20)(16,21,25,26)(18,27,28,22)(5,6)(7,9)(8,10)(11,12)(13,15)(14,20)(16,18)(17,23)(19,24)(21,22)(25,28)(26,27) involution — undirected(2,3)(5,6)(7,11)(8,10)(9,12)(14,17)(15,24)(16,25)(22,27) involution — undirected(1,3,4,2)(5,7)(6,9)(8,12)(10,11)(13,16)(14,21)(15,18)(17,26)(19,25)(20,22)(23,27)(24,28)(13,17,19,14)(15,23,24,20)(16,26,25,21)(18,27,28,22)(13,18)(14,22)(15,16)(17,27)(19,28)(20,21)(23,26)(24,25) 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.