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