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