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