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