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