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