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