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