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