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