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