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