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