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