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