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