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