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