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