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