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