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