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