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