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