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