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