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