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