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