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