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